Transcranial Doppler Sonography: Atypical Dicrotic Pulse Waveforms in a Man with HIV Infection and Severe Cardiomyopathy.

A 27-year-old human immunodeficiency virus--positive man presented with abdominal pain. Computed tomography of the abdomen revealed large right pleural effusion, pericardial effusion and marked ascites with diffuse intra- and extraperitoneal lymphadenopathy. Echocardiography showed severely reduced left ventricular systolic function.

Transcranial Doppler identifies a malfunctioning extraventricular drain.

Transcranial Doppler (TCD) is an invaluable tool allowing real-time monitoring of physiologic blood flow velocity changes. We present a case where TCD monitoring for vasospasm after subarachnoid hemorrhage identified blood flow velocity changes consistent with sudden increased intracranial pressure (ICP) due to a malfunctioning extraventricular drain. The primary team was alerted to these findings, and immediately revised her shunt with normalization of ICP and TCD.

Volume flow rate of common carotid artery measured by Doppler method and Color Velocity Imaging Quantification (CVI-Q).

Background: Common carotid artery (CCA) volume flow rate (VFR) is clinically useful for study of cerebrovascular disease. Color Velocity Imaging Quantification (CVI-Q; Philips Ultrasound International, Irvine, CA), previously reported as accurate and reliable, tracks the flow lumen over the cardiac cycle, as well as mean spatial velocity, which is multiplied by vessel area to obtain VFR. VFR can also be obtained by Doppler sampling for mean velocity, and vessel area based on static B-mode lumen diameter.

Transcranial Doppler ultrasound: a new method of monitoring hemispheric anesthetization during the intracarotid amobarbital procedure.

Background: Electroencephalography (EEG) is traditionally used to assess the duration of hemispheric anesthetization and to monitor return of function in the anesthetized hemisphere during the intracarotid amobarbital procedure (IAP), but EEG changes are not consistently seen. The authors evaluated the role of continuous transcranial Doppler (TCD) monitoring as an alternative to EEG.

Methods: The authors performed both continuous TCD monitoring and EEG during the IAP in 10 patients with medically intractable partial epilepsy.

Ophthalmic artery flow direction on color flow duplex imaging is highly specific for severe carotid stenosis.

Background/purpose: Collateral flow patterns are important risk factors for brain ischemia in the presence of internal carotid artery (ICA) stenosis or occlusion. Ophthalmic artery (OA) flow reversal, routinely studied by transcranial Doppler sonography, is an important marker for high-grade ICA stenosis or occlusion. The authors sought to define the value of assessing OA flow direction with color flow duplex ultrasonography (CDUS) in the setting of significant ICA disease.